component
CD74HCT21M
Public Made by Adomby adom
Texas Instruments Gates, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"slug": "cd74hct21m",
"version": "0.1.0",
"type": "component",
"description": "Texas Instruments Gates, SOIC-14. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"tags": [
"component",
"logic ics",
"cd74hct21m",
"factory-2.0.0",
"extractor-text"
],
"dependencies": {},
"hero": {
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"path": "docs/hero.png"
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"viewers/symbol.html",
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"cd74hct21m-etched.glb"
],
"component": {
"mpn": "CD74HCT21M",
"manufacturer": "Texas Instruments",
"package": "SOIC-14",
"pin_count": 14,
"category": "Logic ICs",
"subcategory": "Gates",
"datasheet": "https://www.ti.com/cn/lit/gpn/cd74hct21",
"parts": {
"symbol": "cd74hct21m.kicad_sym",
"footprint": "cd74hct21m.kicad_mod",
"model_3d": "cd74hct21m-hero.glb",
"model_3d_plain": "cd74hct21m-etched.glb",
"model_3d_step": "cd74hct21m-etched.step",
"model_3d_step_plain": "cd74hct21m.step",
"lbr": "cd74hct21m.lbr"
},
"distributor_links": {
"lcsc": "C2868924",
"digikey": "296-26021-5-ND",
"mouser": "595-CD74HCT21M"
},
"distributor_check": {
"checked_at": "2026-10-29T02:27:17Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "296-26021-5-ND",
"status": "found",
"lifecycle": "Obsolete"
},
"mouser": {
"pn": "595-CD74HCT21M",
"status": "found",
"lifecycle": "Obsolete"
}
},
"pins": [
{
"number": "1",
"name": "1A",
"type": "input",
"description": "Channel 1 input A of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "2",
"name": "1B",
"type": "input",
"description": "Channel 1 input B of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "3",
"name": "NC",
"type": "unconnected",
"description": "Not internally connected; the datasheet lists this pin as NC and it may be left unconnected."
},
{
"number": "4",
"name": "1C",
"type": "input",
"description": "Channel 1 input C of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "5",
"name": "1D",
"type": "input",
"description": "Channel 1 input D of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "6",
"name": "1Y",
"type": "output",
"description": "Channel 1 output Y of the 4-input AND gate, a balanced CMOS push-pull output; it drives HIGH only when all four inputs are HIGH."
},
{
"number": "7",
"name": "GND",
"type": "power_in",
"description": "Ground reference for the device; the absolute maximum continuous current through VCC or GND is ±50 mA."
},
{
"number": "8",
"name": "2Y",
"type": "output",
"description": "Channel 2 output Y of the 4-input AND gate, a balanced CMOS push-pull output; it drives HIGH only when all four inputs are HIGH."
},
{
"number": "9",
"name": "2A",
"type": "input",
"description": "Channel 2 input A of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "10",
"name": "2B",
"type": "input",
"description": "Channel 2 input B of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "11",
"name": "NC",
"type": "unconnected",
"description": "Not internally connected; the datasheet lists this pin as NC and it may be left unconnected."
},
{
"number": "12",
"name": "2C",
"type": "input",
"description": "Channel 2 input C of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "13",
"name": "2D",
"type": "input",
"description": "Channel 2 input D of the 4-input AND gate (Y = A·B·C·D); inputs are LSTTL/CMOS compatible with VIL(max) = 0.8 V and VIH(min) = 2 V at 4.5 V to 5.5 V VCC."
},
{
"number": "14",
"name": "VCC",
"type": "power_in",
"description": "Positive supply, 4.5 V to 5.5 V recommended operating range, with absolute maximum rating of 7 V; a 0.1 µF bypass capacitor is recommended."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The MPN CD74HCT21M is listed as Obsolete in the package option addendum (page 15), with no orderable; Pin 3 and pin 11 are NC (not internally connected) and are not assigned a pin type in the datasheet ; The datasheet's pin functions table gives brief functional descriptions only. Input and output limit"
],
"pages_sent": 24,
"cost_usd": 0.0745,
"at": "2026-10-29T02:27:01"
},
"datasheet": {
"url": "https://www.ti.com/cn/lit/gpn/cd74hct21",
"pages": 24,
"sha256": "11fe0afbe009c65b",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 14,
"described": 14,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
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"file": "cd74hct21m.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
6.0,
8.7,
1.75
],
"zmin_mm": -0.0,
"centre_offset_mm": 0.0,
"footprint_binding": "identity",
"sha256": "3b9a775da256c8afcc28dcddfbc2eb3f266107fe61ce8446d96f2c52b6f44a70",
"checked": "2026-10-29",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "cd74hct21m-etched.step",
"role": "eda",
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"seat": "z = 0",
"extents_mm": [
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8.7,
1.75
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"zmin_mm": -0.0,
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"sha256": "0d3c6a2da4bfe7a812efb57b980dbbbdb3ee611c27e52ee7a8b65b319ca26709",
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],
"package_dims": {
"package_code": "D0014A",
"source_page": 20,
"D": {
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"range_mm": [
8.55,
8.75
]
},
"E1": {
"nom_mm": 3.9,
"range_mm": [
3.8,
4.0
]
},
"E": {
"nom_mm": 6.0,
"range_mm": [
5.8,
6.2
]
},
"e": {
"nom_mm": 1.27,
"range_mm": [
null,
null
]
},
"A": {
"nom_mm": 1.75,
"range_mm": [
null,
1.75
]
},
"source": "datasheet package drawing, every number found on its page (extract_pins --task dims)",
"model_check": {
"file": "cd74hct21m.step",
"verdict": "PASS",
"reasons": [
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],
"by": "factory/package_fit.py"
}
}
}
}